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s � TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration (pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW2 11/18/98 749 1673 -924 000 -- -- -- -- -- -- MW2 03/30/99 749 -- -- -- -- -- -- -- -- -- MW2 05/05/99 749 1520 -771 000 -- -- -- -- -- -- MW2 08/20/99 749 1668 -9 19 000 101 456 808 24 2 253 681 MW2 12/06/99 749 1688 -939 000 <1 <1 <1 <1 52 <1 MW2 02/29/00 749 1442 -693 000 <1 <1 <1 <1 <50 <1 MW2 05/16/00 749 1445 -696 0 00 <1 <1 <1 <1 <50 <l MW2 09/11/00 749 1682 -933 0 00 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW2 12/13/00 749 1667 -9 18 000 2 6 1 5 9 69 <0 5 MW2 03/08/01 749 1581 -832 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MIN? 06/21/01 749 17 15 -966 000 <0 5 <0 5 <0 5 <0 5 81 1 2 N1\1,2 06/21/01 749 <5* MW2 09/20/01 749 1781 -1032 000 -- -- -- -- -- -- MW2 12/04/01 7 15 1779 -1064 000 096 <0 5 <0 5 <0 5 61 10* MW2 03/05/02 7 15 1655 -940 000 1 70 <0 5 <0 5 <0 5 101 h 1 90 MW2 03/05/02 7 15 <0 5* MW2 06/11/02 7 15 1749 -1034 000 -- -- -- -- -- MW2 09/10/02 7 15 1860 -1145 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW2 12/18/02 715 1834 -1119 000 11 <05 <05 <05 700 h <05 MW2 03/24/03 7 15 17 86 -1071 0 00 1 30 <0 5 <0 5 <0 5 945 h <0 5 MW2 06/11/03 7 15 1799 -1084 000 070 <0 5 <0 5 <0 5 52 1 h <0 5 MW2 09/17/03 715 1936 -1221 000 260 <05 <05 <05 187 h l3 MW2 09/17/03 7 15 <0 5* MW2 12/08/03 7 15 1935 -1220 000 1 70 <0 5 <0 5 <0 5 127 h 0 8 MW2 12/08/03 7 15 <0 5* MW2 03/02/04 715 1784 -1069 000 250 <0 5 <0 5 <0 5 115 h 1 5 MW2 03/02/04 7 15 <0 5* MW3 01187 914 -- -- -- 17 640 -- 400 32,000 -- MW3 07/16/87 9 14 1926 -10 12 000 830 600 190 436 1,700 -- MW3 04/11/88 9 14 2243 -13 29 000 450 970 210 860 4,600 -- MW3 09/13/88 9 14 2495 -1578 0 04 Not sampled- LPH t,1projects1739424riasterlwp1g030413942gw+xis Pa6e 6 of 52